rsslave

------------------------------------------------------------------
------------------------------------------------------------------

local codename = 'rsslave'
local codeversion = '0.1.1.0'
local whoami = tonumber(os.getComputerID ())
local verbose = false

term.clear ()
print (">>>"..codename.." Version "..codeversion.."@ID:"..whoami)

------------------------------------------------------------------
------------------------------------------------------------------

local msg_expected_paramcount = 4 -- message format: <SenderID>|<ReceiverID>|<Secret>|<Command>
local shared_secret = "OpenUpMofo"
local listenChannel = 59999
local config_filename = 'rsslave.conf'
local current_status = false

------------------------------------------------------------------

local function parseMessage (msg)
    local msgparam = {}
    for param in string.gmatch (msg, "[^|]+") do
        table.insert (msgparam, param)
    end

    return msgparam
end

------------------------------------------------------------------

local function readConfig ()
    local cfgfile = fs.open (config_filename, 'r')

    if (cfgfile == nil) then
        print ("*error reading config: "..config_filename)
    else
        local rsout = cfgfile.readLine ()
        cfgfile.close ()
        print ("*read from config: "..rsout)
        return (rsout)
    end
end

------------------------------------------------------------------



-- MAIN ----------------------------------------------------------

os.loadAPI ('calicommAPI')
--calicommAPI.enableDebug (true)
calicommAPI.initModems ()

local rs_signal_output = readConfig ()

calicommAPI.openModemChannel (calicommAPI.modemtable[1][1], listenChannel)

while true do
    print "*listening..."
    local event, modemSide, senderChannel, replyChannel, message, senderDistance = os.pullEvent("modem_message")

    local msg_elements = {}
    msg_elements = parseMessage (message)

    if (msg_expected_paramcount ~= #msg_elements) then
        print ("*invalid number of message elements")
    elseif (whoami ~= tonumber(msg_elements[2])) then
        print ("*message is not for me")
    elseif (shared_secret ~= msg_elements[3]) then
        print ("*sender failed to authenticate")
    else
        print ("*found valid message")
        if (msg_elements[4] == 'on') then
            print ("*redstone signal @"..rs_signal_output..":ON")
            redstone.setOutput (rs_signal_output, true)
            current_status = true
        elseif (msg_elements[4] == 'off') then
            print ("*redstone signal @"..rs_signal_output..":OFF")
            redstone.setOutput (rs_signal_output, false)
            current_status = false
        end
    end
end
calicommAPI.closeModemChannel (calicommAPI.modemtable[1][1], listenChannel)